Stone-saw



OFFC.

PETER SWEENEY, OF BUFFALO, NFV YORK.

STONE-SAW.

Specification of Letters Patent No. 25,287, dated August 30, 1859.

To all whom it may concern:

Be it known that I, PETER SWEENEY, of Buffalo, in the county of Erie andState of New York, have invented a new and useful Improvement inStone-Saws; and I do hereby declare that the following is a full. clear,and exact description of the same, reference being had to the annexeddrawings, making a part of this specification, in which- Figure l, is aside view of my invention. Fig. 2, a sectio-n of the same, taken in theline fr, Fig. l. Fig. 3, a section of the same, taken in the line y, y,Fig. l. Fig. 4, a section of a cutter wheel.

Similar letters of reference indicate corresponding parts in the severalfigures.

To enable those skilled in the art to fully understand and construct myinvention I will proceed to describe it.

A, A, represent two circular plates or disks which may be of cast metalplaced on a shaft B, and in close contact. These plates may be securedtogether, in any proper manner, for instance by bolts with their headsand nuts fitted ini-recesses made to receive them by a counter sink.

Between the plates A, A, a series of circular cutters C, are placed.These cutters may be of steel or chilled cast iron and theyprojectbeyond the peripheries of the plates A, A. Any proper number of cuttersmay be used and their peripheries may be serrated or cut like a saw orrasp, or may be of Zig-Zag form as shown clearly at a, in Fig. 4. Thecutters C, are placed loosely on their axes D, so as to rotate thereon,theaxes being stationary and having their ends b, which fit in theplates A, A, of square or round form. The central parts c, of the axeson which the cutters C, rotate are of course cylindrical and they arelarger in diameter than the square ends Z), and therefore prevent theaxes from slipping out laterally from the plates. The axes D, are simplymetal pins with t-he centers turned 'in cylindrical form and their endssquared or rounded. Two of the cutters C, are made of dish-form, and areplaced obliquely between the plates, see Fig. 2, the others may beplaced parallelly between the plates as shown in Fig. 3. By thisarrangement the cutters will form a kerf sufficiently wide to receivethe plates A, A. The axes D, of the oblique cutters are of course placedobliquely in the plates in order to make their peripheries projectbeyond the sides of the plates to forni the wide kerf7 the two obliquecutters being placed in opposite positions as shown clearly in Fig. 2,but the axes of the other cutters are fitted in the plates at rightangles with their plane of rotation as shown in Fig. 3.

The shaft B, of the plates A, A, may be rotated `in any proper way, andthe usual or any proper arrangement of means devised for applying thedevice to its work.

From the above description it will be seen that the cutters may befirmly retained in position as their axes I), have a bearing at each endand the plates also serve to support them preventing all lateral strain.

Although the plates A, A, are circular and rotated forming a rotarycutting tool, still essentially the same device may be used for areciprocating cutting tool by having the cutters C, placed betweenrectangular plates and all the cutters bearing on the work at the sametime.

The idea of attaching rotary cutters near the edges of disks andhorizontal saws or plates, is not my invention nor is'it broadly claimedby me, being seen in Samuel Chapman, Jrs. Patent Novel. 29,1853. Thedifficulty heretofore attending the use of rotary cutters placed nearthe edges of disks or plates, is that the pivots of the said cuttershaving but one bearing, or being attached to the disks or plates onlyupon one side, soon causes the cutters to wear loose, allowing them tofall over sidewise, and thus to strike violently against the edges ofthe stone on entering the kerf thereof. The result is that the cutterssoon become so bent and broken as to be unfit for use. But the doublebearing could not be used with the revolving disk saws placed with theirsides parallel with the side of the plate to which they are pivoted,without making the plate or plates wider than the saw-kerf. To obviatethis difficulty and atthe same time secure the advantages of the doublebearings for the cutters I have devised the dishformed cutter, and hungit obliquely between the plates.

The cutters being placed between two disks or plates, their pivots havea firm bearing at each end, and both sides of the cutters are firmlyheld up and protected by thc plates between which they are secured, sothat no matter how much the pivots of the cutters may Wear or loosen thecutters themselves lcan never become bent or get out of place, While atthe same time the kerf is as Wide as the entire thickness of the plates.

In the use of my improvement no screws, rivets, or other devices arenecessary to keep the pivots or the cutters in place. They may be saidto be selifastening, since the plates A, A, being pressed together attheir centers, have a clamping action at their edges which serves tohold the pivots and. cutters in proper place, Without other fastenings.'lo remove any of the cutters it is only necessary to press apart theedges of the plates A, A, suiiiciently -far to allow the 15 pivots (b)`to slip out.

Having thus described my invention l claim as new and desire to secureby Letters Patent,- The employment of two plates A, A, in 20 combinationwith the disk form, cutters C, arranged substantially as and for thepurpose herein shown and described.

PETER SWEENEY.

Vitnesses H. WAssoN, R. R. HAYES.

